CN215503275U - Medical portable ultrasonic scalpel and control system thereof - Google Patents

Abstract

Translated fromChinese

本实用新型是一种医用便携式超声波手术刀，属于超声波手术刀技术领域，为解决现有超声波手术刀集成度不高、无法保证处于谐振状态以及无法及时反馈频率的问题；医用便携式超声波手术刀由超声换能器、阻抗匹配模块、微控制器、信号产生模块、光电隔离模块、功率放大模块、锁相环电路、电压电流采样反馈电路、直流电压变换模块、直流升压电路、人机交互模块和充电模块组成；本发明利用阻抗匹配网络电路整体呈纯阻态，并结合超声波换能器将电流、电压采样信息反馈至处理器，实现手术刀保持谐振状态，超声波手术刀采用模块化设计，因此刀身、刀头、换能器、电池为可分离式结构，需要时可以迅速组装拆卸，便于医务人员收纳与携带。

The utility model relates to a medical portable ultrasonic scalpel, which belongs to the technical field of ultrasonic scalpels. In order to solve the problems of low integration of the existing ultrasonic scalpel, inability to ensure that it is in a resonance state and unable to feedback frequency in time; the medical portable ultrasonic scalpel is composed of Ultrasonic transducer, impedance matching module, microcontroller, signal generation module, photoelectric isolation module, power amplifier module, phase-locked loop circuit, voltage and current sampling feedback circuit, DC voltage conversion module, DC boost circuit, human-computer interaction module The invention uses the impedance matching network circuit as a whole to be in a pure resistance state, and combines the ultrasonic transducer to feed back the current and voltage sampling information to the processor, so as to maintain the resonant state of the scalpel. The ultrasonic scalpel adopts a modular design. Therefore, the blade body, the blade head, the transducer, and the battery are detachable structures, which can be quickly assembled and disassembled when needed, which is convenient for medical staff to store and carry.

Description

Medical portable ultrasonic scalpel and control system thereof

Technical Field

The utility model relates to a medical portable ultrasonic scalpel and a control system thereof, belonging to the technical field of ultrasonic scalpels.

Background

An ultrasonic scalpel is a high-frequency electrosurgical device and is mainly used for operations such as cutting biological tissues, closing blood vessels and the like. The ultrasonic surgical knife has the characteristics of less bleeding, less damage to surrounding tissues, quick postoperative recovery and the like, is acted on human tissues to take protein coagulation as an effect end point, cannot cause side effects such as tissue drying and burning, has no current passing through the human body when the knife head works, and is widely applied to an operating room.

Outdoor operation environment is complicated, and traditional ultrasonic scalpel is bulky, and is inconvenient to carry, and needs stable 220V alternating current power supply, is difficult to accomplish quick deployment, uses fast. For this reason, a small number of people have proposed a method of making the ultrasonic scalpel portable.

The existing handheld ultrasonic scalpel driving power supply based on Boost topology only provides a miniaturized Boost topology driving power supply, but a complete frequency automatic tracking circuit is not designed, so that an ultrasonic transducer cannot be always in a resonance state, and the efficiency of surgery can be influenced finally.

In the existing development of portable ultrasonic physiotherapy instruments based on frequency automatic tracking, a set of complete portable ultrasonic scalpel is designed, but a circuit does not use a chip resistor and a chip capacitor, PCB layering processing is not carried out, the size of final equipment is large, and a display module is not designed in a paper, so that medical staff cannot visually see the current power working state of the ultrasonic scalpel.

The existing ultrasonic scalpel can only work at a fixed frequency, a gear switch for adjusting power is not designed, and two different functions of electrocoagulation and electrosection cannot be realized. As two common working modes in surgery, electrosurgery uses high-density high-frequency current to intensively heat the surface of local tissues, and electrocoagulation uses lower-frequency power and lower current density to heat bleeding and moist tissues. Therefore, a novel medical portable ultrasonic scalpel is needed, which makes up the defects of the existing ultrasonic scalpel and achieves sufficient portability and miniaturization.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems that the existing ultrasonic scalpel is not high in integration level, cannot be guaranteed to be in a resonance state and cannot feed back frequency in time, the utility model provides a medical portable ultrasonic scalpel and a control system thereof; the technical scheme of the utility model is as follows:

the first scheme is as follows: a medical portable ultrasonic scalpel control system comprises: the system comprises a microcontroller, an ultrasonic transducer, a signal generation module, a power amplification module, an impedance matching network, a frequency tracking module, a direct-current power supply module and a human-computer interaction module; the microcontroller is used as a core, and a human-computer interaction module and a signal generation module which are connected with the microcontroller are used for issuing instructions through electric signals; the signal generating module is electrically connected with the power amplifying module, the impedance matching network and the ultrasonic transducer, the ultrasonic transducer outputs ultrasonic waves, sampling information is fed back to the frequency tracking module through an electric signal, and the electric signal is fed back to the microcontroller through the frequency tracking module; the direct current power supply module is responsible for supplying power for the ultrasonic scalpel.

Further, the microcontroller adopts a 32-bit microprocessor MK60DN512VLQ10 based on an ARM Cortex-M4 kernel architecture; the supply voltage of MK60DN512VLQ10 is 3.3V.

Further, the signal generation module controls a driving chip of the power MOS tube to generate a square wave signal by using an AD9851 frequency synthesizer.

Further, the direct current power supply module adopts a 12V lithium battery for power supply; a charging module and a linear voltage stabilizing module are arranged in the direct current power supply module, and the linear voltage stabilizing module comprises an AMS117-3.3 voltage stabilizer and an AMS117-5 voltage stabilizer; the charging module adopts a BQ24040 lithium battery power supply management chip.

Furthermore, the man-machine interaction module comprises a starting key and a display device, and the microprocessor outputs the radio frequency signal to the display device.

Scheme II: a medical portable ultrasonic scalpel is realized on the basis of the control system, and the scalpel uses a PCB layering mode, so that the whole circuit is integrated in a scalpel body under the condition of meeting the thickness requirement.

The utility model has the beneficial effects that:

the impedance matching network is utilized to eliminate capacitive components in the equivalent circuit of the ultrasonic transducer, so that the whole circuit is in a pure impedance state, and current and voltage sampling information is fed back to the processor by combining the ultrasonic transducer, so that the scalpel is kept in a resonance state, and two different functions of electrocoagulation and electrosection are realized;

ultrasonic scalpel adopts the modularized design, therefore the integrated level is high, and wherein blade, tool bit, transducer, battery are detachable structure, can assemble rapidly when needing and dismantle, and the postoperative can be disinfected alone with each module dismantlement. The disassembled ultrasonic scalpel can be placed into a special suitcase, and medical staff can conveniently store and carry the ultrasonic scalpel.

Drawings

FIG. 1 is a schematic structural view of a medical portable ultrasonic scalpel;

FIG. 2 is a schematic diagram of a microprocessor of a medical portable ultrasonic scalpel;

FIG. 3 is a schematic diagram of a reset circuit;

FIG. 4 is a schematic diagram of a JTAG download emulation circuit;

FIG. 5 is a schematic diagram of a voltage conversion circuit;

FIG. 6 is a schematic diagram of a clock source circuit;

FIG. 7 is a schematic diagram of an RTC clock circuit;

FIG. 8 is a schematic diagram of an AD9851 peripheral circuit;

FIG. 9 is a schematic diagram of an elliptical low pass filter circuit;

FIG. 10 is a schematic diagram of a photo-isolation circuit;

FIG. 11 is a schematic diagram of a half-bridge circuit;

FIG. 12 is a schematic diagram of a TR2104 driver chip;

FIG. 13 is a schematic diagram of an AD8302 phase amplitude measurement circuit;

FIG. 14 is a schematic diagram of a current sampling circuit;

FIG. 15 is a schematic diagram of a voltage sampling circuit;

FIG. 16 is a schematic diagram of a 5V voltage acquisition circuit;

FIG. 17 is a schematic diagram of a 3.3V voltage acquisition circuit;

FIG. 18 is a schematic of a boost circuit;

FIG. 19 is a schematic circuit diagram of a key control module;

FIG. 20 is a schematic view of a display module;

in order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Detailed Description

The specific implementation mode is as follows: a medical portable ultrasonic scalpel and a control system thereof are disclosed, which comprises an ultrasonic transducer, an impedance matching module, a microcontroller, a signal generating module, a photoelectric isolation module, a power amplification module, a phase-locked loop circuit, a voltage and current sampling feedback circuit, a direct current voltage conversion module, a direct current booster circuit, a man-machine interaction module and a charging module; the following is a detailed implementation:

(1) the ultrasonic transducer converts electric energy into mechanical vibration to cause the cutter bar of the ultrasonic cutter to vibrate longitudinally, so as to transmit the energy. During this energy conversion, the ultrasonic blade generates mechanical shock, cavitation and thermal effects. The mechanical impact can break protein hydrogen bonds, and the temperature rises at the same time, so that the biological tissue is locally liquefied and homogenized, and the tissue is torn, thereby achieving the cutting effect. In design, the series connection of the capacitance-inductance resistance can be equivalent.

(2) In the working process of the ultrasonic scalpel, due to the existence of the capacitive characteristic, the reactive power of the ultrasonic power supply can be increased, and the conversion efficiency can be lowered. In order to solve the problem, the capacitive reactance component in the equivalent circuit is eliminated by adopting a novel T-shaped matching mode, so that the circuit is in a pure impedance state as a whole.

(3) The microcontroller adopts a 32-bit microprocessor MK60DN512VLQ10 of the Feichalcar company based on an ARM Cortex-M4 kernel framework. The supply voltage of MK60DN512VLQ10 is 3.3V; microprocessor MK60DN512VLQ10 minimal system design.

(4) The frequency of the driving signal output by the ultrasonic generator is determined by a half-bridge driving control signal, the driving control signal is a square wave, and the resolution of the frequency of the square wave signal output by the PWM module of the MK60DN512VLQ10 microprocessor is far less than the accuracy requirement of a few Hertz, so that the signal generating module uses a special signal generating chip AD9851 to generate the square wave signal.

Preferably, the AD9851, due to its high degree of integration, requires only a small number of peripheral circuits to form the signal generator. The peripheral circuit mainly comprises an output square wave duty ratio adjusting circuit and a filter circuit. As shown in FIG. 8, D0-D7 are connected to PTB0-PTB7 pins of MK60DN512VLQ10, RST, CLK and FQUD pins are connected to PTA8, PTA9 and PTA10 pins, 50K omega slide rheostat R52 is used for adjusting the duty ratio of the output square wave signal, Y1 is a 180M crystal oscillator circuit, and the chip supply voltage VCC is 3.3V.

Specifically, the supply voltage of the AD9851 is 3.3V, the amplitude of the square wave signal generated by the AD9851 is 3.3V, the square wave signal is used for controlling the driving chip of the power MOS transistor, since the supply voltage required by the latter is 12V, if the two are directly connected together, the irrecoverable damage to the control circuit is easily caused, so the present embodiment adopts a measure of adding photoelectric isolation between the two to avoid the occurrence of the damage to the control circuit.

(5) In the power amplification module, because the voltage and the driving current of the square wave signal generated by the AD9851 are very small, the power of the square wave signal is far from the requirement of driving the ultrasonic transducer, and therefore the voltage and the current of the square wave signal need to be amplified, namely the power amplification is carried out. In the embodiment, a half-bridge inverter circuit is selected, and the power MOS transistor is driven by using the IR2104 chip.

(6) The phase-locked loop circuit has the advantages that dynamic equivalent parameters of a series branch of the ultrasonic piezoelectric transducer can change along with changes of parameters such as load and temperature when the ultrasonic piezoelectric transducer works, so that the resonance frequency of the series branch can change, in order to enable the transducer to work in a series resonance state all the time, an ultrasonic generator must detect the resonance frequency of the series branch of the transducer in real time, then the frequency of an output signal is adjusted to be consistent with the detected resonance frequency of the series branch of the transducer, and frequency dynamic tracking is achieved. Frequency control is typically implemented using phase-locked loop (PLL) control techniques.

Preferably, a phase comparison chip AD8302 is used, after the phase comparison is finished, the comparison result is directly sent to the microcontroller for processing, and then the microcontroller controls the frequency of the output signal of the direct digital frequency synthesizer, so that the transducer works in the series resonance state again.

(7) The voltage and current sampling feedback circuit is characterized in that the sampling circuit is used for sampling voltage signals at two ends of the transducer and current signals flowing through the transducer and then sending the voltage signals and the current signals to the phase detection circuit for phase comparison. The current sampling circuit adopts a current transformer to collect current flowing through the transducer, and the voltage sampling circuit adopts a voltage division circuit.

(8) The direct-current voltage conversion module is powered by a 12V lithium battery, and in order to convert the voltage into 3.3V and 5V which can be used by each chip, a linear voltage stabilization module needs to be designed, wherein the 3V voltage is obtained through AMS117-3.3, and the 5V voltage is obtained through AMS 117-5.

(9) The DC booster circuit is an important component of the ultrasonic knife driving power supply circuit. According to the requirement that the Boost ratio of the ultrasonic blade driving voltage is improved, a Boost circuit is adopted to provide the voltage for a half-bridge circuit after the voltage is raised.

(10) Man-machine interaction module, button module need possess the function of adjusting resonant frequency, sets for two kinds of gear frequency gears: one is a low frequency grade, which completes the electrocoagulation function to volatilize the liquid components (mainly water) of the tissue without reaching the tissue bursting degree; the other is a high-frequency gear to complete the electric cutting function, so that the tissue components of the tissue are rapidly expanded and burst to be separated, thereby realizing cutting and generating high temperature to form the hemostatic effect. In addition, a switch is set to control the on-off of the power output. The display module adopts a 1602 liquid crystal display screen, and the POWER ON word is available when the equipment is powered ON, and the POWER OFF word is available when the equipment is powered OFF;

preferably, the human-computer interaction module can also display the working state of the scalpel through a radio-frequency signal sent by the microprocessor to display equipment, and the display equipment can be mobile phones, tablet computers, display screens and other equipment supporting wireless connection.

(11) The charging module is a portable linear charging chip applied to lithium ion and lithium polymer batteries with limited area, and a power supply part of the chip can be supplied by the current mainstream USB power supply or AC power adapter, so that a special charger is not required to be carried, and the charging module is very convenient.

The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made on the basis of the technical solutions of the present invention should be included in the scope of the present invention.

Claims (6)

Translated fromChinese

1.一种医用便携式超声波手术刀控制系统，其特征在于：包括微控制器、超声波换能器、信号产生模块、功率放大模块、阻抗匹配网络、频率跟踪模块、直流电源模块和人机交互模块；以微控制器为核心，通过电信号为与其连接的人机交互模块和信号产生模块下发指令；信号产生模块通过电性连接功率放大模块，阻抗匹配网络和超声波换能器，超声波换能器输出超声波，并将采样信息通过电信号反馈至频率跟踪模块，再由频率追踪模块反馈电信号至微控制器；直流电源模块负责为超声波手术刀供电。1. a medical portable ultrasonic scalpel control system is characterized in that: comprise microcontroller, ultrasonic transducer, signal generation module, power amplifier module, impedance matching network, frequency tracking module, DC power supply module and human-computer interaction module ; With the microcontroller as the core, it sends instructions to the human-computer interaction module and signal generation module connected to it through electrical signals; the signal generation module is electrically connected to the power amplifier module, impedance matching network and ultrasonic transducer, ultrasonic transducer The device outputs ultrasonic waves, and feeds back the sampling information to the frequency tracking module through electrical signals, and then the frequency tracking module feeds back electrical signals to the microcontroller; the DC power module is responsible for powering the ultrasonic scalpel.2.根据权利要求1所述的一种医用便携式超声波手术刀控制系统，其特征在于：所述微控制器采用的是基于ARM Cortex-M4内核构架的32位微处理器MK60DN512VLQ10；MK60DN512VLQ10的供电电压为3.3V。2. a kind of medical portable ultrasonic scalpel control system according to claim 1 is characterized in that: what described microcontroller adopts is the 32-bit microprocessor MK60DN512VLQ10 based on ARM Cortex-M4 core framework; the power supply voltage of MK60DN512VLQ10 is 3.3V.3.根据权利要求2所述的一种医用便携式超声波手术刀控制系统，其特征在于：所述信号产生模块使用AD9851频率合成器，控制功率MOS管的驱动芯片产生方波信号。3 . The medical portable ultrasonic scalpel control system according to claim 2 , wherein the signal generation module uses an AD9851 frequency synthesizer to control the drive chip of the power MOS tube to generate a square wave signal. 4 .4.根据权利要求3所述的一种医用便携式超声波手术刀控制系统，其特征在于：所述直流电源模块，采用12V锂电池供电；所述直流电源模块内置充电模块和线性稳压模块，所述线性稳压模块包括AMS117-3.3稳压器和AMS117-5稳压器；所述充电模块采用BQ24040锂电池电源管理芯片。4. A medical portable ultrasonic scalpel control system according to claim 3, characterized in that: the DC power module is powered by a 12V lithium battery; the DC power module has a built-in charging module and a linear voltage regulator module, so The linear voltage regulator module includes an AMS117-3.3 voltage regulator and an AMS117-5 voltage regulator; the charging module adopts a BQ24040 lithium battery power management chip.5.根据权利要求1所述的一种医用便携式超声波手术刀控制系统，其特征在于：所述人机交互模块包括启动按键与显示设备，所述微处理器通过射频信号输出至显示设备。5 . The medical portable ultrasonic scalpel control system according to claim 1 , wherein the human-computer interaction module comprises a start button and a display device, and the microprocessor outputs the radio frequency signal to the display device. 6 .6.一种医用便携式超声波手术刀，是根据权利要求1-5任一一项所述控制系统为基础而实现的，其特征在于：该手术刀使用PCB分层模式，在满足厚度要求的情况下，使整个电路集成在刀身中。6. A medical portable ultrasonic scalpel, realized on the basis of the control system according to any one of claims 1-5, characterized in that: the scalpel uses a PCB layered mode, and in the case of satisfying the thickness requirement , so that the entire circuit is integrated in the blade body.

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